检索结果-内蒙古大学图书馆

Active feedback cooling of a SiN membrane resonator by electrostatic actuation

学校读者我要写书评

暂无评论

arXiv 2021年

作者： Borrielli, Antonio Bonaldi, Michele Serra, Enrico Sarro, Pasqualina Maria Morana, Bruno Institute of Materials for Electronics and Magnetism IMEM-CNR Trento unit c/o Fondazione Bruno Kessler Via alla Cascata 56/C Povo TrentoIT-38123 Italy Dept. of Microelectronics and Computer Engineering ECTM DIMES Delft University of Technology Feldmanweg 17 Delft2628 CT Netherlands Trento Institute for Fundamental Physics and Application Povo Trento38123 Italy

Feedback-based control techniques are useful tools in precision measurements as they allow to actively shape the mechanical response of high quality factor oscillators used in force detection measurements. In this paper we implement a feedback technique on a high-stress low-loss SiN membrane resonator, exploiting the charges trapped on the dielectric membrane. A properly delayed feedback force (dissipative feedback) enables the narrowing of the thermomechanical displacement variance in a similar manner to the cooling of the normal mechanical mode down to an effective temperature Te f f. In the experiment here reported we started from room temperature and gradually increasing the feedback gain we were able to cool down the first normal mode of the resonator to a minimum temperature of about 124mK. This limit is imposed by our experimental set-up and in particular by the the injection of the read-out noise into the feedback. We discuss the implementation details and possible improvements to the technique. Copyright © 2021, The Authors. All rights reserved.

关键词： Resonators

Quantum motion of a squeezed mechanical oscillator attained via a optomechanical experiment

学校读者我要写书评

暂无评论

arXiv 2020年

作者： Vezio, P. Chowdhury, A. Bonaldi, M. Borrielli, A. Marino, F. Morana, B. Prodi, G.A. Sarro, P.M. Serra, E. Marin, F. I-50019 Italy CNR-INO L.go Enrico Fermi 6 FirenzeI-50125 Italy Institute of Materials for Electronics and Magnetism Nanoscience-Trento-FBK Division Povo Trento38123 Italy Trento Institute for Fundamental Physics and Application Povo TrentoI-38123 Italy INFN Sezione di Firenze Dept. of Microelectronics and Computer Engineering ECTM/DIMES Delft University of Technology Feldmanweg 17 Delft2628 CT Netherlands Dipartimento di Matematica Università di Trento Povo TrentoI-38123 Italy I-50019 Italy

We experimentally investigate a mechanical squeezed state realized in a parametrically-modulated membrane resonator embedded in an optical cavity. We demonstrate that a quantum characteristic of the squeezed dynamics can be revealed and quantified even in a moderately warm oscillator, through the analysis of motional sidebands. We provide a theoretical framework for quantitatively interpreting the observations and present an extended comparison with the experiment. A notable result is that the spectral shape of each motional sideband provides a clear signature of a quantum mechanical squeezed state without the necessity of absolute calibrations, in particular in the regime where residual fluctuations in the squeezed quadrature are reduced below the zero-point level. Copyright © 2020, The Authors. All rights reserved.

关键词： Quantum optics

Probing quantum gravity effects with quantum mechanical oscillators

学校读者我要写书评

暂无评论

arXiv 2020年

作者： Bonaldi, M. Borrielli, A. Chowdhury, A. Di Giuseppe, G. Li, W. Malossi, N. Marino, F. Morana, B. Natali, R. Piergentili, P. Prodi, G.A. Sarro, P.M. Serra, E. Vezio, P. Vitali, D. Marin, F. Institute of Materials for Electronics and Magnetism Nanoscience-Trento-FBK Division Povo TrentoI-38123 Italy Trento Institute for Fundamental Physics and Application Povo TrentoI-38123 Italy CNR-INO L.go E. Fermi 6 FirenzeI-50125 Italy I-50019 Italy I-62032 Italy INFN Sezione di Perugia via A. Pascoli PerugiaI-06123 Italy Dept. of Microelectronics and Computer Engineering ECTM/DIMES Delft University of Technology Feldmanweg 17 Delft2628 CT Netherlands Dipartimento di Fisica Università di Trento Povo TrentoI-38123 Italy I-50019 Italy I-50019 Italy

Phenomenological models aiming to join gravity and quantum mechanics often predict effects that are potentially measurable in refined low-energy experiments. For instance, modified commutation relations between position and momentum, that accounts for a minimal scale length, yield a dynamics that can be codified in additional Hamiltonian terms. When applied to the paradigmatic case of a mechanical oscillator, such terms, at the lowest order in the deformation parameter, introduce a weak intrinsic nonlinearity and, consequently, deviations from the classical trajectory. This point of view has stimulated several experimental proposals and realizations, leading to meaningful upper limits to the deformation parameter. All such experiments are based on classical mechanical oscillators, i.e., excited from a thermal state. We remark indeed that decoherence, that plays a major role in distinguishing the classical from the quantum behavior of (macroscopic) systems, is not usually included in phenomenological quantum gravity models. However, it would not be surprising if peculiar features that are predicted by considering the joined roles of gravity and quantum physics should manifest themselves just on purely quantum objects. On the base of this consideration, we propose experiments aiming to observe possible quantum gravity effects on macroscopic mechanical oscillators that are preliminary prepared in a high purity state, and we report on the status of their realization. Copyright © 2020, The Authors. All rights reserved.

关键词： Gravitation

Quantum Signature of a Squeezed Mechanical Oscillator

学校读者我要写书评

暂无评论

Physical Review Letters 2020年第2期124卷 023601-023601页

作者： A. Chowdhury P. Vezio M. Bonaldi A. Borrielli F. Marino B. Morana G. A. Prodi P. M. Sarro E. Serra F. Marin CNR-INO L.go Enrico Fermi 6 I-50125 Firenze Italy European Laboratory for Non-Linear Spectroscopy (LENS) Via Carrara 1 I-50019 Sesto Fiorentino (FI) Italy Institute of Materials for Electronics and Magnetism Nanoscience-Trento-FBK Division 38123 Povo Trento Italy Istituto Nazionale di Fisica Nucleare (INFN) Trento Institute for Fundamental Physics and Application I-38123 Povo Trento Italy INFN Sezione di Firenze Via Sansone 1 I-50019 Sesto Fiorentino (FI) Italy Dept. of Microelectronics and Computer Engineering /ECTM/DIMES Delft University of Technology Feldmanweg 17 2628 CT Delft Netherlands Dipartimento di Fisica Università di Trento I-38123 Povo Trento Italy Dipartimento di Fisica e Astronomia Università di Firenze Via Sansone 1 I-50019 Sesto Fiorentino (FI) Italy

Recent optomechanical experiments have observed nonclassical properties in macroscopic mechanical oscillators. A key indicator of such properties is the asymmetry in the strength of the motional sidebands produced in the probe electromagnetic field, which is originated by the noncommutativity between the oscillator ladder operators. Here we extend the analysis to a squeezed state of an oscillator embedded in an optical cavity, produced by the parametric effect originated by a suitable combination of optical fields. The motional sidebands assume a peculiar shape, related to the modified system dynamics, with asymmetric features revealing and quantifying the quantum component of the squeezed oscillator motion.

关键词： Optomechanics Quantum optics Squeezing of quantum noise

Sympathetic cooling of a radio-frequency LC circuit to its ground state in an optoelectromechanical system

学校读者我要写书评

暂无评论

arXiv 2020年

作者： Malossi, Nicola Piergentili, Paolo Li, Jie Serra, Enrico Natali, Riccardo Di Giuseppe, Giovanni Vitali, David Physics Division School of Science and Technology University of Camerino CamerinoMCI-62032 Italy INFN Sezione di Perugia via A. Pascoli PerugiaI-06123 Italy Kavli Institute of Nanoscience Department of Quantum Nanoscience Delft University of Technology Delft2628CJ Netherlands Zhejiang Province Key Laboratory of Quantum Technology and Device Department of Physics State Key Laboratory of Modern Optical Instrumentation Zhejiang University Hangzhou310027 China Institute of Materials for Electronics and Magnetism Nanoscience-Trento-FBK Division Povo TrentoI-38123 Italy INFN Trento Institute for Fundamental Physics and Application Povo TrentoI-38123 Italy Dept. of Microelectronics and Computer Engineering ECTM/DIMES Delft University of Technology Feldmanweg 17 Delft2628 CT Netherlands CNR-INO Largo Enrico Fermi 6 FirenzeI-50125 Italy

We present a complete theory for laser cooling of a macroscopic radio-frequency LC electrical circuit by means of an optoelectromechanical system, consisting of an optical cavity dispersively coupled to a nanomechanical oscillator, which is in turn capacitively coupled to the LC circuit of interest. The driven optical cavity cools the mechanical resonator which in turn sympathetically cools the LC circuit. We determine the optimal parameter regime where the LC resonator can be cooled down to its quantum ground state, which requires a large optomechanical cooperativity, and a larger electromechanical cooperativity. Moreover, comparable optomechanical and electromechanical coupling rates are preferable for reaching the quantum ground state. Copyright © 2020, The Authors. All rights reserved.

关键词： Resonant circuits

Quantum signature of a squeezed mechanical oscillator

学校读者我要写书评

暂无评论

arXiv 2019年

作者： Chowdhury, A. Vezio, P. Bonaldi, M. Borrielli, A. Marino, F. Morana, B. Prodi, G.A. Sarro, P.M. Serra, E. Marin, F. CNR-INO L.go Enrico Fermi 6 FirenzeI-50125 Italy I-50019 Italy Institute of Materials for Electronics and Magnetism Nanoscience-Trento-FBK Division Povo Trento38123 Italy Trento Institute for Fundamental Physics and Application Povo TrentoI-38123 Italy INFN Sezione di Firenze Dept. of Microelectronics and Computer Engineering ECTM/DIMES Delft University of Technology Feldmanweg 17 Delft2628 CT Netherlands Dipartimento di Fisica Università di Trento Povo TrentoI-38123 Italy I-50019 Italy

Some predictions of quantum mechanics are in contrast with the macroscopic realm of everyday experience, in particular those originated by the Heisenberg uncertainty principle, encoded in the non-commutativity of some measurable operators. Nonetheless, in the last decade opto-mechanical experiments have actualized macroscopic mechanical oscillators exhibiting such non-classical properties. A key indicator is the asymmetry in the strength of the motional sidebands generated in an electromagnetic field that measures interferometrically the oscillator position. This asymmetry is a footprint of the quantum motion of the oscillator, being originated by the non-commutativity between its ladder operators. A further step on the path highlighting the quantum physics of macroscopic systems is the realization of strongly non-classical states and the consequent observation of a distinct quantum behavior. Here we extend indeed the analysis to a squeezed state of a macroscopic mechanical oscillator embedded in an optical cavity, produced by parametric effect originated by a suitable combination of optical fields. The motional sidebands assume a peculiar shape, related to the modified system dynamics, with asymmetric features revealing and quantifying the quantum component of the squeezed oscillator motion. Copyright © 2019, The Authors. All rights reserved.

关键词： Oscillistors

Quantum thermometry in optomechanics

学校读者我要写书评

暂无评论

Quantum thermometry in optomechanics

Quantum Information and Measurement, QIM 2019

作者： Chowdhury, A. Vezio, P. Bonaldi, M. Borrielli, A. Marino, F. Morana, B. Pandraud, G. Pontin, A. Prodi, G.A. Sarro, P.M. Serra, E. Marin, F. CNR INO L.go Enrico Fermi 6 FirenzeI-50125 Italy I-50019 Italy I-50019 Italy Institute of Materials for Electronics and Magnetism Nanoscience-Trento-FBK Division Povo Trento38123 Italy Trento Institute for Fundamental Physics and Application Povo TrentoI-38123 Italy Dept. of Microelectronics and Computer Engineering ECTM EKL Delft University of Technology Feldmanweg 17 Delft2628 CT Netherlands Department of Physics and Astronomy University College London Gower Street LondonWC1E 6BT United Kingdom Dipartimento di Fisica Università di Trento Povo TrentoI-38123 Italy I-50019 Italy

We describe a method to control the cavity detuning in optomechanics experiments. This helps accurate measurements of the asymmetry in the motional sidebands, that testify the quantum behavior of the oscillator and qu... 详细信息

ISBN: (纸本)9781943580569

关键词： Acoustooptic modulators Energy transfer Optomechanics Oscillators Photons Resonance

Probing deformed commutators with micro- and nano-oscillators 14

学校读者我要写书评

暂无评论

Probing deformed commutators with micro- and nano-oscillator...

14th Marcel Grossman Meeting On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories

作者： Bawaj, Mateusz Biancofiore, Ciro Bonaldi, Michele Bonfigli, Federica Borrielli, Antonio Giuseppe, Giovanni Di Marconi, Lorenzo Marino, Francesco Natali, Riccardo Pontin, Antonio Prodi, Giovanni A. Serra, Enrico Vitali, David Marin, Francesco School of Science and Technology Physics Division University of Camerino via Madonna delle Carceri 9 CamerinoMCI-62032 Italy Sezione di Perugia Italy I-38123 Italy I-38123 Italy I-50019 Italy I-50019 Italy CNR-Istituto Nazionale di Ottica largo E. Fermi 6 FirenzeI-50125 Italy I-38123 Italy I-38123 Italy Dept. of Microelectronics and Computer ECTM DIMES Technology Centre Delft University of Technology Feldmanweg 17 2628 CT Delft PO Box 5053 Delft2600 GB Netherlands I-50019 Italy

ISBN: (纸本)9789813226593

A minimal observable length is a common feature of theories that aim to merge quantum physics and gravity. Quantum mechanically, this concept is associated to a minimal uncertainty in position measurements, which is encoded in deformed commutation relations. Once applied in the Heisenberg dynamics, they give effects potentially detectable in low energy experiments. For instance, an isolated harmonic oscillator becomes intrinsically nonlinear and its dynamics shows a dependence of the oscillation frequency on the amplitude, as well as the appearance of higher harmonics. Here we analyze the free decay of micro and nano-oscillators, spanning a wide range of masses, and we place upper limits to the parameters quantifying the commutator deformation. Copyright © 2018 by the *** rights reserved.

关键词： Uncertainty analysis

Calibrated quantum thermometry in cavity optomechanics

学校读者我要写书评

暂无评论

arXiv 2018年

作者： Chowdhury, A. Vezio, P. Bonaldi, M. Borrielli, A. Marino, F. Morana, B. Pandraud, G. Pontin, A. Prodi, G.A. Sarro, P.M. Serra, E. Marin, F. CNR-INO L.go Enrico Fermi 6 FirenzeI-50125 Italy I-50019 Italy I-50019 Italy Institute of Materials for Electronics and Magnetism Nanoscience-Trento-FBK Division Povo Trento38123 Italy Trento Institute for Fundamental Physics and Application Povo TrentoI-38123 Italy Dept. of Microelectronics and Computer Engineering ECTM-EKL Delft University of Technology Feldmanweg 17 Delft2628 CT Netherlands Department of Physics and Astronomy University College London Gower Street LondonWC1E 6BT United Kingdom Dipartimento di Fisica Università di Trento Povo TrentoI-38123 Italy I-50019 Italy

Cavity optomechanics has achieved the major breakthrough of the preparation and observation of macroscopic mechanical oscillators in peculiarly quantum states. The development of reliable indicators of the oscillator properties in these conditions is important also for applications to quantum technologies. We compare two procedures to infer the oscillator occupation number, minimizing the necessity of system calibrations. The former starts from homodyne spectra, the latter is based on the measurement of the motional sidebands asymmetry in heterodyne spectra. Moreover, we describe and discuss a method to control the cavity detuning, that is a crucial parameter for the accuracy of the latter, intrinsically superior procedure. Copyright © 2018, The Authors. All rights reserved.

关键词： Thermometers